/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */

package org.software.bird.common.stringparse;



import java.text.DecimalFormat;
import java.text.ParseException;

import org.software.bird.common.exception.OutOfRangeException;
import org.software.bird.som.exception.InvalidNumberException;


/**
 * 对Number基本类型的解析类
 * 
 * @author <a href="mailto:cyyan@isoftstone.com">cyyan</a>
 * @version $Id: NumberParsor.java,v0.1 2007-12-7 下午04:35:28 cyyan Exp$
 */
public class NumberParser extends Parser {

	final static DecimalFormat aDecimalFormat = new DecimalFormat();
	/**
	 * 解析字符成基本类型，如果解析的结果是BigDecimal，BigInteger将导致范围异常
	 * 
	 * @param 待解析的字符串
	 * 
	 * @exception InvalidNumberException 无效的字符串
	 * @exception OutOfRangeException超过BigInteger，BigDecimal
	 * 
	 */
	public Object parse(String str) throws InvalidNumberException, OutOfRangeException {
		if (str == null || str.trim().equals("")) {
			throw new InvalidNumberException("empty exception");
		}
		Number num = null;
		try {
			num = aDecimalFormat.parse(str);
		} catch (ParseException e) {
			throw new InvalidNumberException("not a number");
		}
		if (num instanceof java.math.BigDecimal || num instanceof java.math.BigInteger) {
			throw new OutOfRangeException("out of range exception");
		}
		return num;
	}

	/**
	 * 不使用此方法
	 * 
	 * @deprecated
	 */
	public Object parse(String str, String pattern) throws Exception {
		return parse(str);
	}
	/**
	 * 不使用此方法
	 * 
	 * @deprecated
	 */
	public void setPattern(String pattern) {
	}
}
